browngw 

All the recent chatter about gearing and sprockets got me interested in making some changes to the '71 Robin Hood. It came to me totally original and wearing an 18 tooth cog with a 46T chain ring. After two years of riding I have found the gearing too big for the type of riding done with this bike. I use it for my leisurely nostalgic cruising about bike. I had a 20T in the parts bin, but my LBS which was once a Raleigh dealer had a new 21T which I paid $8.00 for.(that was the original price on the part).
I also replaced the chain with a new KMC. The only difficult part of the job was sizing the chain. Even a 1/2 link was not a help. In the center of the dropouts, I had fender clearance issues with the Schwalbe tires. so I went back to about where it was before and not requiring a 1/2 link as before. No chance to ride it yet due to crappy winter weather but I think it will fine.
While I was at it, I replaced the hard thin white plastic bar tape with something more comfortable if not as period.